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下面是引用 cnmars 于 2005-03-25 08:54 发表的:
Bringing It Home With THX Surround EX
THX Surround EX is the home version of this latest advance in hyper-realistic sound technology. Available exclusively in THX-licensed Ultra and Select Series products, THX Surround EX decodes a back surround signal from the left and right surround channels on specially encoded DVD movie releases. Unlike products offering "6.1" channel decoding schemes, only select THX Certified components adhere to superior performance specifications through the following features.
Redirects bass energy in the Surround back channels to the subwoofer, ensuring optimum bass performance.
Requires Re-Equalization™ of the Surround back channels to match characteristics of the front and left/right surround channels.
Synchronizes the Surround Back Left and Surround Back Right speakers in time and position relative to the listener, providing a seamless surround sound experience.
Preserves the original sound perspective in soundtracks from older films with mono surround channels by automatically re-directing the surround signal to both Surround Left and Surround Right rather than to the Surround back speakers only.
Maintains the same technical standards for Surround back channels as for Left and Right channel surround, eliminating compromise in channel separation, noise, headroom, bandwidth and decoding accuracy.
Flexibility For Licensees and System Designers
The THX Surround EX program specification is designed to ensure compatibility with movie software and maximum performance in home theater and music reproduction applications. At the same time, the specification allows licensees some flexibility in differentiating products and configuring systems to meet varying customer needs.
THX Surround EX receivers or A/V amplifiers may include power amplification for both surround back outputs, or simply provide line level outputs for external amplifiers. Internal power amplifiers must meet THX Home Theater specifications for surround amplifier performance.
THX Ultra licensees are encouraged to include proprietary DSP modes for the two Surround back output channels to enhance the audio performance for 5.1 music recordings.
Licensees may choose from a number of different IC chips and circuit boards now offered for THX Surround EX technology. Current suppliers include Analog Devices, the Crystal Division of Cirrus Logic, Momentum Data Systems, Motorola, Sample Rate Systems and Zoran.
For optimum results, THX recommends use of two THX Ultra-certified dipole speakers for the back surrounds. However, allowing for customer preference, a pair of direct radiating speakers can also be used for the back surrounds under a new THX specification.
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